Regulating-valve



(No Model.) 3 Sheets-Sheet 1.

N; G. LOGKE.

' REGULATING VALVE. No. 509,923. Patented Dec. 5,1893.

(No Model.) 9 3 Sheets-Sheet 2.

N. O. LOOKE.

REGULATING VALVE. No. 509,923. Patented Dec. 5, 1893.

I i I f 3 M a a z J Z 1 momma.) 3 Sheets-Shet s. N. G. LOGKE.

REGULATI NG VALVE.

No. 509,923. Patented Dec. 5,1893.

UNITED STATES PATENT OFFICE.

NATHANIEL O. LOOKE, OF SALEM, MASSACHUSETTS.

REGULATlNG-VALVE.

SPECIFICATION forming part of Letters Patent No. 509,923, dated December5, 1893.

Application filed February 18,1892. Serial No. 421,392. (No model.)

ToaZZ whom it may concern.-

Be it known that I, NATHANIEL CHASE LOOKE, of Salem, in the county ofEssex and State of Massachusetts, have invented an Improvement inRegulating-Valves, of which the following is a specification, referencebeing had to the accompanying drawings, in which- Figure l is asectional elevation illustrating one form of apparatus with my improvement; Fig. 2 a like elevation of asecond form of apparatus with myimprovement; and Fig. 3 a like elevation of a third form of apparatuswith my improvement.

In many forms of regulating valves the main valve is controlled by amotor which is supplied with steam or other fluid under pressure,through a conduit which is of such small area, or otherwise sorestricted, that the pressure tending to actuate the motor can be widelyvaried by opening or closing an exhaust passage from the motor; and myinvention consists in forming that conduit through the main valve, andreducing its area by a stud as will now be more fully explained byreference to the drawings.

In all the figures A is the casing, a the main valve and a a partition(in which is the seat of valve a), dividing the casing A into a highpressure chamber A and a low pressure chamber A in the usual way and aswill be fully understood without further description.

In order to insure the desired difference of pressure on opposite sidesof partition a. and valve a (which is in general the office of thisclass of apparatus) the main valve or. is controlled by a motor B, whichis connected to valve a and which is automatically moved in a directionto open valve a when the pressure in the low pressure chamber fallsbelow the desired amount, but in a direction to close valve a when thepressure in the low pressure chamber exceeds the desired amount. Motionis given to motor B by steam, (or Water or gas as the case may be) whichflows from the high pressure chamber A through a conduit and actuatesmotorB to move valve or against the force of spring a in Fig. 1, themotion of main valve or in Fig. 1 caused by the motor carrying valve oraway from its seat, and the motion of main valve a in Fig. 1 caused byits spring a carrying valve a to its seat.

ward its seat. In Fig. 2 both motions of main valve a are caused by themotor B. In Fig. 3 the motor B tends to move valve or toward These threeexamples, in one of which the main valve is moved away fromits seat bythe motor and toward its seat by a spring, in the second of which themain valve. is moved in both directions by the motor, and

in the third of which the main valve is moved only toward its seat bythe motor, are all well known in other forms of this apparatus, and arehere shown for the reason that my invention is applicable to all ofthem.

In all forms a conduit which connects the chamber of motor B with thehigh pressure chamber is essential, but in my invention that conduit isthrough the main valve and restricted by a stud, as will now beexplained in detail. In Fig. 1, the bore through the main valve extendswell down the stem, and a side opening in the stem allows the fluidunder pressure to flow from the high pressure chamber through the borein main valve a and its stem; but this flow is greatly restrict ed bythe stud d which almost fills the bore through valve a, so that all thesteam which actuates motor B is compelled to leak past stud cl on itsway through main valve a. Stud d must not of course fit the bore invalve to so tightly as to prevent motion of valve a from and toward itsseat, but with this in mind stud d may be made as snug a fit aspossible; for in practice it is difficult to make stud d too close afit, so long as valve on will move properly on stud d. The steam whichthus leaks through valve 0. past stud d fills the chamber 1) in whichmotor B reciprocates provided the exhaust conduit through stud d fromthat chamber is closed by the diaphragm F; but when that exhaust conduitis opened the escape of steam through the exhaust is more rapid than itsflow through the conduit through valve a, restricted as that conduit isby stud d; and consequently the pressure tending to move motor B can bevaried greatly by the motion of diaphragm F; Vhen steam or other fluidunder pressure is let on to the apparatus of Fig. 1, it leaks past studcl and through bore of valve a, and almost instantly fills thechamber 1) of motor B, (for diaphragm F then closes the exhaust conduit)and motor B moves to open main valve a, thus supplying the low pressurechamber. Consequently the pressure in'the low pressure chamber rises andas the low pressure chamber is open through conduit f to the chamber ofdiaphragm F, that diaphragm will be lifted from stud d as soon as thepressure in the low pressure chamber is sufficient; and as this motionof diaphragm F opens the exhaust con-. duit through stud d the pressurein the chamber 12 of motor B will fall and the force of spring a aidedby the low pressure against motor B, in Fig. 1, will close main valve a.Should the low pressure then fall below the desired amount diaphragm Fwill be forced by its spring f down upon stud d to close the exhaustconduit,when the pressure in the chamber 1) of motor B will'increase,thus opening valve a andsupplying more pressure to the low pressurechamber; but acting as before, as soon as the low pressure is broughtback to the desired amount. This operation is the usual and familiaroperation, in substance, of this classof apparatuaas will be plain toall skilled in the art; but the new principle involved in my inventionis a con duit through'the valve of ample area but restricted by a plugwhich nearly fills it, and this is a valuable improvement for it notonly greatly simplifies the construction of this class of apparatus; butis a far better and more practical plan of obtaining the restricted areaof the conduit than any heretofore known.

In Fig. 2, the fluid from the high pressure chamber A leaks'past thestud dand fills the chamber 1) of motor B when diaphragm Fis pressedupon stud d; thereby causing sufficient pressure under motor B to forcevalve a off its seat, and allow steam to flow from high pressure chamberA to low pressure chamber A But when the pressure in low pressurechamber A reaches the desired amount, it acts, throu gh conduit f, tolift diaphragm F and open the exhaust conduit; whereupon the lowpressure, always in chamher I) of motor B, causes motor B to close valvea.

, In Fig. 3 the fluid in high pressure cham ber A forces valve it offits seat, and supplies low pressure chamber A but when the low pressurereaches the desired amount it acts through conduit f to force diaphragmF down upon stud d, and thus closes the exlimited to the conduit throughthe main valve restrictedby a stud, the other inventions shown hereinbeing described and claimed in my patents, No. 475,585, dated May 24',1892, and No. 497,985, datedlviay 23, 1893';

What I claim as my invention is In a reducing valve comprising a mainvalve and'a motor controlling it,-a conduit leading from the highpressure chamber to the motor chamber through the main valve, and a studrestricting that conduit, combined and operating substantially asdescribed.

NATHANIEL o. LOGKE.

Witnesses:

J. E. MAYNADIER, EDWARD I. BEACH.

